[FFmpeg-devel] [PATCH] Made minor changes to get the decklink avdevice code to build using Visual C++

Aaron Levinson alevinsn at aracnet.com
Fri May 5 10:34:19 EEST 2017


On 4/16/2017 4:11 PM, Aaron Levinson wrote:
> On 4/15/2017 6:13 AM, Aaron Levinson wrote:
>> On 4/15/2017 4:19 AM, Marton Balint wrote:
>>>
>>> On Thu, 13 Apr 2017, Aaron Levinson wrote:
>>>
>>>> On 4/13/2017 1:23 PM, Hendrik Leppkes wrote:
>>> [...]

Ping, and in addition, I've provided a new patch below since the original won't apply anymore.  I've also adjusted the patch text a little bit.  The original patch went through a few different reviews.  These changes are necessary to get the decklink code to build using MSVC on Windows.

Thanks,
Aaron Levinson

------------------------------------------------------------------------------------

>From 90d20d87401584138f6bdea5567b92e7dfe07f1f Mon Sep 17 00:00:00 2001
From: Aaron Levinson <alevinsn at aracnet.com>
Date: Fri, 5 May 2017 00:20:56 -0700
Subject: [PATCH] decklink:  Fixed MSVC build issues

Purpose: Made minor changes to get the decklink avdevice code to build
using Visual C++.

Notes: Made changes to configure per Hendrik Leppkes's review of first
and second versions of patch.

Comments:

-- configure: Added if enabled decklink section and setting
   decklink_indev_extralibs and decklink_outdev_extralibs here for
   both mingw and Windows.  Also eliminated the setting of these
   variables in the mingw section earlier in the file.

-- libavdevice/decklink_common.cpp: Switched the order of the include
   of libavformat/internal.h to workaround build issues with Visual
   C++.  See comment in file for more details.

-- libavdevice/decklink_dec.cpp:
a) Rearranged the include of libavformat/internal.h (for reasons as
   described above).
b) Made slight alteration to an argument for call to av_rescale_q() to
   workaround a compiler error with Visual C++.  This appears to only
   be an issue when building C++ files with Visual C++.  See comment
   in code for more details.

-- libavdevice/decklink_enc.cpp: Rearranged the include of
   libavformat/internal.h (for reasons as described above).

Signed-off-by: Aaron Levinson <alevinsn at aracnet.com>
---
 configure                       | 11 +++++++++--
 libavdevice/decklink_common.cpp |  7 ++++++-
 libavdevice/decklink_dec.cpp    | 17 +++++++++++++++--
 libavdevice/decklink_enc.cpp    |  7 ++++++-
 4 files changed, 36 insertions(+), 6 deletions(-)

diff --git a/configure b/configure
index 883ec390d6..bbb9fab738 100755
--- a/configure
+++ b/configure
@@ -4847,8 +4847,6 @@ case $target_os in
         else
             target_os=mingw32
         fi
-        decklink_outdev_extralibs="$decklink_outdev_extralibs -lole32 -loleaut32"
-        decklink_indev_extralibs="$decklink_indev_extralibs -lole32 -loleaut32"
         LIBTARGET=i386
         if enabled x86_64; then
             LIBTARGET="i386:x86-64"
@@ -5947,6 +5945,15 @@ if ! disabled sdl2; then
 fi
 enabled sdl2 && enable sdl && add_cflags $sdl2_cflags && add_extralibs $sdl2_extralibs
 
+if enabled decklink; then
+    case $target_os in
+        mingw32*|mingw64*|win32|win64)
+            decklink_outdev_extralibs="$decklink_outdev_extralibs -lole32 -loleaut32"
+            decklink_indev_extralibs="$decklink_indev_extralibs -lole32 -loleaut32"
+            ;;
+    esac
+fi
+
 disabled securetransport || { check_func SecIdentityCreate "-Wl,-framework,CoreFoundation -Wl,-framework,Security" &&
     check_lib securetransport "Security/SecureTransport.h Security/Security.h" "SSLCreateContext SecItemImport" "-Wl,-framework,CoreFoundation -Wl,-framework,Security"; }
 
diff --git a/libavdevice/decklink_common.cpp b/libavdevice/decklink_common.cpp
index f01fba953e..cbb591ce64 100644
--- a/libavdevice/decklink_common.cpp
+++ b/libavdevice/decklink_common.cpp
@@ -19,6 +19,12 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+/* Include internal.h first to avoid conflict between winsock.h (used by
+ * DeckLink headers) and winsock2.h (used by libavformat) in MSVC++ builds */
+extern "C" {
+#include "libavformat/internal.h"
+}
+
 #include <DeckLinkAPI.h>
 #ifdef _WIN32
 #include <DeckLinkAPI_i.c>
@@ -28,7 +34,6 @@
 
 extern "C" {
 #include "libavformat/avformat.h"
-#include "libavformat/internal.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/bswap.h"
diff --git a/libavdevice/decklink_dec.cpp b/libavdevice/decklink_dec.cpp
index 67eaf97e89..69f790d606 100644
--- a/libavdevice/decklink_dec.cpp
+++ b/libavdevice/decklink_dec.cpp
@@ -19,12 +19,17 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+/* Include internal.h first to avoid conflict between winsock.h (used by
+ * DeckLink headers) and winsock2.h (used by libavformat) in MSVC++ builds */
+extern "C" {
+#include "libavformat/internal.h"
+}
+
 #include <DeckLinkAPI.h>
 
 extern "C" {
 #include "config.h"
 #include "libavformat/avformat.h"
-#include "libavformat/internal.h"
 #include "libavutil/avutil.h"
 #include "libavutil/common.h"
 #include "libavutil/imgutils.h"
@@ -262,8 +267,16 @@ static int64_t get_pkt_pts(IDeckLinkVideoInputFrame *videoFrame,
                 res = videoFrame->GetHardwareReferenceTimestamp(time_base.den, &bmd_pts, &bmd_duration);
             break;
         case PTS_SRC_WALLCLOCK:
-            pts = av_rescale_q(wallclock, AV_TIME_BASE_Q, time_base);
+        {
+            /* MSVC does not support compound literals like AV_TIME_BASE_Q
+             * in C++ code (compiler error C4576) */
+            // pts = av_rescale_q(wallclock, AV_TIME_BASE_Q, time_base);
+            AVRational timebase;
+            timebase.num = 1;
+            timebase.den = AV_TIME_BASE;
+            pts = av_rescale_q(wallclock, timebase, time_base);
             break;
+        }
     }
     if (res == S_OK)
         pts = bmd_pts / time_base.num;
diff --git a/libavdevice/decklink_enc.cpp b/libavdevice/decklink_enc.cpp
index 5105967101..be01bcd64c 100644
--- a/libavdevice/decklink_enc.cpp
+++ b/libavdevice/decklink_enc.cpp
@@ -22,11 +22,16 @@
 #include <atomic>
 using std::atomic;
 
+/* Include internal.h first to avoid conflict between winsock.h (used by
+ * DeckLink headers) and winsock2.h (used by libavformat) in MSVC++ builds */
+extern "C" {
+#include "libavformat/internal.h"
+}
+
 #include <DeckLinkAPI.h>
 
 extern "C" {
 #include "libavformat/avformat.h"
-#include "libavformat/internal.h"
 #include "libavutil/imgutils.h"
 }
 
-- 
2.12.2.windows.2


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